'\" t
.\"     Title: persistent-event-log
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 11/04/2025
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "PERSISTENT\-EVENT\-L" "1" "11/04/2025" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-persistent-event-log \- Send NVMe persistent event log page request, returns result and log
.SH "SYNOPSIS"
.sp
.nf
\fInvme persistent\-event\-log\fR <device> [\-\-action=<action> | \-a <action>]
                        [\-\-log\-len=<log\-len> | \-l <log\-len>] [\-\-raw\-binary | \-b]
                        [\-\-output\-format=<fmt> | \-o <fmt>] [\-\-verbose | \-v]
.fi
.SH "DESCRIPTION"
.sp
Retrieves the NVMe persistent event log page from an NVMe device and provides the returned structure\&.
.sp
The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1)\&.
.sp
On success, the returned persistent event log structure may be returned in one of several ways depending on the option flags; the structure may parsed by the program and printed in a readable format or the raw buffer may be printed to stdout for another program to parse\&.
.SH "OPTIONS"
.PP
\-a <action>, \-\-action=<action>
.RS 4
While try to retrieve this log action the controller shall take during processing this persistent log page command\&. This mandatory field, based on the value issued it may Read Log Data, Establish Context and Read Log Data or Release Context can occur\&. For More details see NVM Express 1\&.4 Spec\&. Section 5\&.14\&.1\&.13 Persistent Event Log (Log Identifier 0Dh)
.RE
.PP
\-l <log\-len>, \-\-log\-len=<log\-len>
.RS 4
Allocates a buffer of <log\-len> bytes size and requests this many bytes be returned in the constructed NVMe command\&. This param is mandatory\&. If <log\-len> given is 0 and action is 0, it will read the Total Log Length(TLL) of the page\&.
.RE
.PP
\-b, \-\-raw\-binary
.RS 4
Print the raw persistent event log buffer to stdout\&.
.RE
.PP
\-o <fmt>, \-\-output\-format=<fmt>
.RS 4
Set the reporting format to
\fInormal\fR,
\fIjson\fR
or
\fIbinary\fR\&. Only one output format can be used at a time\&.
.RE
.PP
\-v, \-\-verbose
.RS 4
Increase the information detail in the output\&.
.RE
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Print the persistent event log page in a human readable format:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme persistent\-event\-log /dev/nvme0
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Print the raw persistent event log to a file:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme persistent\-event\-log /dev/nvme0 \-\-raw\-binary > persistent_log\&.raw
.fi
.if n \{\
.RE
.\}
.sp
It is probably a bad idea to not redirect stdout when using this mode\&.
.RE
.SH "NVME"
.sp
Part of the nvme\-user suite
